CN217258844U - Visible-near infrared frequency division type radiation refrigeration film based on bionic rose petal structure - Google Patents
Visible-near infrared frequency division type radiation refrigeration film based on bionic rose petal structure Download PDFInfo
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- CN217258844U CN217258844U CN202221117980.XU CN202221117980U CN217258844U CN 217258844 U CN217258844 U CN 217258844U CN 202221117980 U CN202221117980 U CN 202221117980U CN 217258844 U CN217258844 U CN 217258844U
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Abstract
The invention relates to a visible-near infrared frequency division type radiation refrigeration film based on a bionic rose petal structure, belongs to the technical field of radiation refrigeration, and aims to solve the problem that the existing radiation refrigeration material cannot give consideration to lighting and refrigeration performance; the surface of the first cone structure is distributed with second cone structures in an array manner. The invention realizes the selective transmission of the radiation refrigeration film to solar radiation energy, realizes the frequency division function of visible-near infrared band and the high emission performance of atmospheric window, and can give consideration to lighting and refrigeration performance, thereby widening the application range of the radiation refrigeration material.
Description
Technical Field
The invention belongs to the technical field of radiation refrigeration, and particularly relates to a visible-near infrared frequency division type radiation refrigeration film based on a bionic rose petal structure.
Background
The radiation refrigeration technology is used as an environment-friendly zero-energy-consumption passive refrigeration technology, can effectively reduce energy consumption generated by conventional refrigeration, relieves energy and environmental crisis, and has wide application prospect. The daytime radiation refrigeration technology can realize the temperature reduction lower than the air temperature without any energy consumption by strongly reflecting solar radiation energy (0.3-2.5 mu m) and utilizing an atmospheric window (8-13 mu m) to perform radiation heat exchange with an outer space. The existing materials for daytime radiation refrigeration comprise radiation refrigeration coatings, radiation refrigeration films, porous polymer structural materials and wood structural materials, are applied to the fields of building external walls, large-scale oil depots, cold chain transportation, airplane gallery bridges, human body thermal management and the like, and realize considerable refrigeration power.
However, the existing daytime radiation refrigeration material carries out indiscriminate strong reflection on full-spectrum solar radiation energy, cannot consider the requirements of application scenes on lighting and appearance, and cannot be applied to scenes such as glass roofs, photovoltaic cells and automobile windows with high requirements on lighting and appearance. The radiation refrigeration materials applied in these scenes need to not only increase the emissivity of the atmospheric window band, but also consider the transmittance of the visible light band. A few radiation-cooling coatings that consider high transmission of visible light fail to shield the near infrared heat from the adverse effects of the cooling load. Therefore, there is a need to develop a new type of radiation refrigeration material that can selectively transmit solar radiation energy and has high emissivity properties in the atmospheric window.
Disclosure of Invention
The invention provides a visible-near infrared frequency division type radiation refrigeration film based on a bionic rose petal structure, which aims to solve the problem that the existing radiation refrigeration material cannot give consideration to lighting and refrigeration performance.
The technical scheme of the invention is as follows:
the visible-near infrared frequency division type radiation refrigeration film based on the bionic rose petal structure comprises a transparent bionic structure layer and a multilayer film structure layer which are arranged from top to bottom and have the bionic rose petal structure,
the surface of the transparent bionic structure layer is provided with first cone structures which are distributed in an array at equal intervals;
second cone structures are distributed on the surface of the first cone structure in an array at equal intervals;
the height ratio of the first cone structure to the second cone structure is 5-20: 0.5-1.5;
the multilayer film structure layer comprises a transparent refrigerating layer and SiO arranged from top to bottom 2 Buffer layer, ITO frequency division layer and SiO 2 A base layer.
Furthermore, the first cone structure is a pyramid structure or a cone structure with a bottom side having at least three sides.
Further, the first cone structure is a triangular pyramid structure, a rectangular pyramid structure or a cone structure.
Further, the second cone structure is a pyramid structure or a cone structure with a bottom side having at least three sides.
Further, the second cone structure is a triangular pyramid structure, a rectangular pyramid structure or a cone structure.
Further, the transparent refrigeration layer is made of SiO 2 Buffer layer, ITO frequency-dividing layer and SiO 2 The thickness ratio of the base layer is 5-100: 0.5-5: 0.5-4: 0.5 to 5.
Furthermore, the transparent bionic structure layer and the transparent refrigerating layer are both made of one of PDMS, PMMA, PVDF or PET.
The invention has the beneficial effects that:
the invention utilizes the comprehensive optical performance of the bionic rose petal structure and various film structures during compounding, realizes the selective transmission of the radiation refrigeration film to solar radiation energy, realizes the frequency division function of visible-near infrared band and the high emission performance of an atmospheric window, and can give consideration to the daylighting and refrigeration performances, thereby widening the application range of the radiation refrigeration technology.
The radiation refrigeration film provided by the invention has the advantages that the minimum average transmittance to near-infrared band light is only 7.8%, the maximum average transmittance to visible light can reach 85.7%, and the maximum average emissivity in an atmospheric window can reach 98.8% through calculation of a Finite Difference Time Domain (FDTD) based on modern electromagnetic theory. The film can enable the radiation refrigeration technology to be applied to facilities with higher requirements on lighting and appearance, such as various large-scale commercial buildings, solar cells, automobile windows and other scenes.
Drawings
FIG. 1 is a schematic structural diagram of a visible-near infrared frequency division type radiation refrigeration film based on a bionic rose petal structure;
in the figure, 1, a transparent bionic structure layer, 1-1, a first cone structure, 1-2 second cone structures, 2, a multilayer thin film structure layer, 2-1, a transparent refrigeration layer, 2-2 and SiO 2 Buffer layer, 2-3 ITO frequency dividing layer, 2-4 SiO 2 A base layer.
Detailed Description
The technical solutions of the present invention are further described below with reference to the following examples, but the present invention is not limited thereto, and any modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention. The process equipment or apparatus not specifically mentioned in the following examples are conventional in the art, and if not specifically mentioned, the raw materials and the like used in the examples of the present invention are commercially available; unless otherwise specified, the technical means used in the examples of the present invention are conventional means well known to those skilled in the art.
Example 1
The embodiment provides a visible-near infrared frequency division type radiation refrigeration film based on a bionic rose petal structure.
The radiation refrigeration film of the embodiment comprises a transparent bionic structure 1 with a bionic rose petal structure and a multilayer film structure layer 2,
the transparent bionic structures 1 are first cone structures 1-1 and are distributed on the upper surface of the multilayer thin film structure layer 2 in an array and at equal intervals; the surface of the first cone structure 1-1 is provided with second cone structures 1-2 in an array and at equal intervals.
In the embodiment, the first cone structure 1-1 is a regular rectangular pyramid structure, the length of the bottom edge of the regular rectangular pyramid structure is 10 μm, and the height of the regular rectangular pyramid structure is 11 μm; the second cone structure 1-2 is a regular rectangular pyramid structure, the length of the bottom edge of which is 1 μm, and the height of which is 1.5 μm.
In this embodiment, the multi-layer thin film structure layer 2 comprises a transparent refrigerating layer 2-1 and SiO from top to bottom 2 Buffer layer 2-2, ITO (indium tin oxide) frequency division layer 2-3 and SiO 2 Base layers 2-4. Wherein the thickness of the transparent refrigerating layer 2-1 is 15 μm, SiO 2 The thickness of the buffer layer 2-2 is 5 μm, the thickness of the ITO frequency division layer 2-3 is 3.5 μm, and SiO 2 The thickness of the base layer 2-4 is 5 μm.
In this embodiment, the transparent biomimetic structure and the transparent refrigeration layer are both made of PDMS (polydimethylsiloxane).
In this embodiment, the shape and size of the transparent bionic structure are designed on the basis of natural rose petals, and the surface structure of the natural rose petals consists of microstructures such as cones and nano folds. The transparent bionic structure prepared by the bionic structure has the functions of reducing visible light reflection loss and improving the emissivity of an atmospheric window.
SiO in multi-layer film structure layer 2 The substrate layer has functions of protecting the ITO frequency division layer and reducing visible light reflection loss when the radiation refrigeration film is adhered to the transparent glass, the ITO frequency division layer has functions of blocking near infrared radiation in sunlight, and SiO 2 The buffer layer has the effects of reducing the refractive index change in the radiation refrigeration film and improving the visible light transmittance, and the transparent refrigeration layer has the effects of improving the emissivity of an atmospheric window and enhancing the refrigeration effect.
By utilizing the comprehensive optical performance of the bionic rose petal structure and various film structures during compounding, the radiation refrigeration film can selectively transmit solar radiation energy, realize the frequency division function of visible-near infrared bands and the high emission performance of an atmospheric window, and ensure that the radiation refrigeration film can give consideration to both lighting and refrigeration performance.
Example 2
The embodiment provides a visible-near infrared frequency division type radiation refrigeration film based on a bionic rose petal structure.
The radiation refrigeration film of the embodiment comprises a transparent bionic structure 1 with a bionic rose petal structure and a multilayer film structure layer 2,
the transparent bionic structure 1 is a first cone structure 1-1 and is distributed on the upper surface of the multilayer thin film structure layer 2 in an array manner; the surface of the first cone structure 1-1 is distributed with second cone structures 1-2 in an array.
In the embodiment, the first cone structure 1-1 is a regular rectangular pyramid structure, the length of the bottom edge of the regular rectangular pyramid structure is 8 μm, and the height of the regular rectangular pyramid structure is 6 μm; the second pyramid structure 1-2 is a regular rectangular pyramid structure with a base length of 0.8 μm and a height of 1 μm.
In this embodiment, the multi-layer thin film structure layer 2 comprises a transparent refrigerating layer 2-1 and SiO from top to bottom 2 Buffer layer 2-2, ITO (indium tin oxide) frequency division layer 2-3 and SiO 2 Base layers 2-4. Wherein the thickness of the transparent refrigerating layer 2-1 is 5 μm and SiO 2 The thickness of the buffer layer 2-2 is 3 μm, the thickness of the ITO frequency division layer 2-3 is 2.5 μm, and SiO 2 The thickness of the base layer 2-4 is 3 μm.
In this embodiment, the transparent biomimetic structure and the transparent refrigeration layer are both made of PDMS (polydimethylsiloxane).
Example 3
The embodiment provides a visible-near infrared frequency division type radiation refrigeration film based on a bionic rose petal structure.
The radiation refrigeration film of the embodiment comprises a transparent bionic structure 1 with a bionic rose petal structure and a multilayer film structure layer 2,
the transparent bionic structure 1 is a first cone structure 1-1 and is distributed on the upper surface of the multilayer thin film structure layer 2 in an array manner; the surface of the first cone structure 1-1 is distributed with second cone structures 1-2 in an array.
In the embodiment, the first cone structure 1-1 is a regular rectangular pyramid structure, the length of the bottom edge of the regular rectangular pyramid structure is 8 μm, and the height of the regular rectangular pyramid structure is 6 μm; the second cone structure 1-2 is a regular rectangular pyramid structure, the length of the bottom edge of which is 0.8 μm, and the height of which is 1 μm.
In this embodiment, the multi-layer film structure layer 2 comprises a transparent refrigerating layer 2-1 and SiO arranged from top to bottom 2 Buffer layer 2-2, ITO (indium tin oxide) frequency division layer 2-3 and SiO 2 Base layers 2-4. Wherein the thickness of the transparent refrigerating layer 2-1 is 11 μm and SiO 2 The thickness of the buffer layer 2-2 is 3 μm, the thickness of the ITO frequency division layer 2-3 is 2 μm, SiO 2 The thickness of the base layer 2-4 is 3 μm.
In this embodiment, the transparent biomimetic structure and the transparent refrigeration layer are both made of PDMS (polydimethylsiloxane).
Claims (7)
1. A visible-near infrared frequency division type radiation refrigeration film based on a bionic rose petal structure is characterized by comprising a transparent bionic structure layer (1) and a multilayer film structure layer (2) which are arranged from top to bottom and have the bionic rose petal structure,
the surface of the transparent bionic structure layer (1) is provided with first cone structures (1-1) in an array and at equal intervals;
the surface of the first cone structure (1-1) is provided with second cone structures (1-2) in an array and at equal intervals;
the height ratio of the first cone structure (1-1) to the second cone structure (1-2) is 5-20: 0.5-1.5;
the multilayer thin film structure layer (2) comprises a transparent refrigerating layer (2-1) and SiO which are arranged from top to bottom 2 Buffer layer (2-2), ITO frequency division layer (2-3) and SiO 2 A base layer (2-4).
2. The visible-near infrared frequency division type radiation refrigerating film based on the bionic rose petal structure is characterized in that the first cone structure (1-1) is a pyramid structure or a cone structure with the bottom edge having at least three edges.
3. The visible-near infrared frequency division type radiation refrigerating film based on the bionic rose petal structure is characterized in that the first cone structure (1-1) is a triangular pyramid structure, a rectangular pyramid structure or a cone structure.
4. The visible-near infrared frequency division type radiation refrigeration film based on the bionic rose petal structure is characterized in that the second cone structure (1-2) is a pyramid structure or a cone structure with the bottom side having at least three sides.
5. The visible-near infrared frequency division type radiation refrigeration film based on the bionic rose petal structure is characterized in that the second cone structure (1-2) is a triangular pyramid structure, a rectangular pyramid structure or a cone structure.
6. The visible-near infrared frequency division type radiation refrigeration film based on the bionic rose petal structure as claimed in claim 1, wherein the transparent refrigeration layer (2-1), SiO 2 Buffer layer (2-2), ITO frequency division layer (2-3) and SiO 2 The thickness ratio of the base layer (2-4) is 5-100: 0.5-5: 0.5-4: 0.5 to 5.
7. The visible-near infrared frequency division type radiation refrigeration film based on the bionic rose petal structure is characterized in that the transparent bionic structure layer (1) and the transparent refrigeration layer (2-1) are both made of one of PDMS, PMMA, PVDF or PET.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221117980.XU CN217258844U (en) | 2022-05-10 | 2022-05-10 | Visible-near infrared frequency division type radiation refrigeration film based on bionic rose petal structure |
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| CN202221117980.XU CN217258844U (en) | 2022-05-10 | 2022-05-10 | Visible-near infrared frequency division type radiation refrigeration film based on bionic rose petal structure |
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| CN217258844U true CN217258844U (en) | 2022-08-23 |
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